Bill-
Nice work! I did this (with help) on another 30 10 yrs ago. That keel was asymetrical - fat on one side mid-chord to the trailing edge and "hollow" on the other aft and very fat forward.
Power planer is indeed the ticket. We used tooling to create template "ridges" with yellow-dyed west filler. Once each was done, we too were able to just drag a bunch of thickened filler across the new template stations (like screeding concrete) and it worked quite well.
It was a long (and physically taxing) project but well worth it. You'll notice a difference (i.e. more consistent on each tack) which always required funky tuning to deal with before. Boat also felt less sticky in the water (but that might have also had to do with burnishing to 1200 too... ;-)
Looks great AND you'll be very happy you did it after you get over the back pain!
Cheers,
Jeff